<template>
    <div class="cmt-container">
        <h3>发表评论</h3>
        <hr>
        <textarea placeholder="请输入要评论的内容(最多输入120字)" maxlength="120" v-model="msg"></textarea>

        <mt-button type="primary" size="large" @click="postComment">发表评论</mt-button>

        
        <div class="cmt-list">
            <div class="cmt-item" v-for="(item,i) in comments" :key="i">
                <div class="cmt-title">
                    第{{ i+1 }}楼&nbsp;&nbsp;用户：{{item.user_name}}&nbsp;&nbsp;发表时间：{{item.add_time | dateFormat}}
                </div>
                <div class="cmt-body">
                    {{ item.content === 'undefined'? '此用户很懒，什么都没有评论':item.content}}
                </div>
            </div>
        </div>
        

        <mt-button type="danger" size="large" plain @click="getMore">加载更多</mt-button>
    </div>
</template>


<script>
import { Tosast } from "mint-ui" 
export default{
    data(){
        return {
            pageIndex:1 ,//默认展示第一页数据
            comments:[] ,//所有的评论数据
            msg:'' //评论输入的内容
        }
    },
    created() {
        this.getComment()
    },
    methods: {
        getComment(){
            this.$http.get('/src/json/comment.json'+"?pageIndex="+this.pageIndex).then(result =>{
                if(result.body.status === 0){
                    //this.comments = result.body.message
                    this.comments = this.comments.concat(result.body.message)
                }else{
                    Toast("获取评论失败")
                }
            })
        },
        getMore(){
            this.pageIndex++
            this.getComment()
        },
        postComment(){
            //校验是否为空内容
            if(this.msg.trim().length ===0 ){
                return Toast("评论内容不能为空！")
            }
            //发表评论
            //参数1:请求的URL地址
            //参数2:提交给服务器的数据对象{content:this.msg}
            //参数3:定义提交时候，表单中数据格式{emulateJSON:true}
            this.$http.post('/src/json/content.json',{content:this.msg.trim()})
            .then(function(result){
                if(result.boda.status ===0 ){
                    //1.拼接出一个评论对象
                    var cmt = { 
                        user_name:'匿名用户', 
                        add_time: Date.now(), 
                        content:this.msg.trim()
                        }
                        this.comments.unshift(cmt)
                        this.msg = ""

                }
            })
        }
    },
    props:["id"]
}    


</script>

<style lang="scss">
.cmt-container{
    h3{
        font-size: 18px;
    }
    textarea{
        font-size: 14px;
        height: 85px;
        margin: 0;
    }
    .cmt-list{
        margin: 5px 0;
        .cmt-item{
            font-size: 13px;
            .cmt-title{
                background-color: #cccccc;
                line-height: 30px;
                
            }
            .cmt-body{
                line-height: 35px;
                text-indent: 2em;
            }
        }
    }
}
</style>
